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Investments - Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 26,656	$ 26,562
Gross Unrealized Gains	347	178
Gross Unrealized Losses	(449)	(707)
Fair Value	26,554	26,033
Allowance for expected credit losses	0	0
Supporting experience-rated products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	8	5
Gross Unrealized Losses	(21)	(30)
Fair Value	501	543
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,759	2,826
Gross Unrealized Gains	35	7
Gross Unrealized Losses	(11)	(38)
Fair Value	2,783	2,795
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	331	712
Gross Unrealized Gains	2	4
Gross Unrealized Losses	(12)	(18)
Fair Value	321	698
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,387	13,043
Gross Unrealized Gains	207	94
Gross Unrealized Losses	(283)	(412)
Fair Value	13,311	12,725
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,742	2,608
Gross Unrealized Gains	45	27
Gross Unrealized Losses	(58)	(111)
Fair Value	2,729	2,524
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	837	792
Gross Unrealized Gains	6	2
Gross Unrealized Losses	(40)	(54)
Fair Value	803	740
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,780	1,731
Gross Unrealized Gains	22	9
Gross Unrealized Losses	(41)	(67)
Fair Value	1,761	1,673
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,806	4,834
Gross Unrealized Gains	30	35
Gross Unrealized Losses	(4)	(7)
Fair Value	4,832	4,862
Redeemable preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14	16
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 14	$ 16

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